Rear road surface irradiation device

A rear road surface irradiation device is provided with: an emergency stop determination unit 6 that makes a determination of vehicle emergency stop or deceleration for the purpose of making an emergency stop on the basis of vehicle information acquired by a vehicle information acquisition unit 1; and a control unit 9 that causes an irradiation unit 10 to irradiate a rear road surface with light of irradiation content with an expression warning of a rear-end collision when the emergency stop determination unit 6 makes the determination of emergency stop or deceleration for the purpose of making an emergency stop. Accordingly, the presence of the vehicle that is making an emergency stop or deceleration for the purpose of making an emergency stop can be conspicuously indicated for a following vehicle while clarifying what action is being called for from the following vehicle. 后方路面照射装置构成为具有紧急停止判断部(6)和控制部(9)，该紧急停止判断部(6)根据车辆信息取得部(1)取得的车辆信息来判断车辆的紧急停止或以紧急停止为目的的减速，该控制部(9)在紧急停止判断部(6)判断出紧急停止或以紧急停止为目的的减速的情况下，使照射部(10)将表现